杭州环北地下快速路隧道工程采用大直径（11.58 m）泥水平衡盾构浅覆土斜交下穿既有沪杭高铁桥涵。为确保高铁运营安全，对桥涵沉降进行监测，同时考虑盾构穿越施工阶段隧道所处的复杂环境条件，通过在管片中埋设纵向和环向钢筋应力计，对盾构施工引起的隧道纵向及环向结构响应进行全过程跟踪实测分析。监测结果表明： 桥涵最大纵向差异沉降率为0.20‰，最大横向差异沉降率为0.30‰，均在铁路安全控制标准内；在隧道穿越施工过程中，盾构总推力随盾构姿态的变化而变化，并对隧道管片受力和桥涵位移产生明显影响，其中，管片纵向轴力呈现“顶部大，底部小”的趋势，环向弯矩呈现“腰部最大，拱顶、拱底次之，两肩最小”的特点，桥涵倾斜方向也会发生变化。研究成果证明： 在大直径泥水盾构穿越施工过程中，为保障施工质量与安全，除了需要对穿越对象进行严格监控之外，对隧道本体进行监控研究也同等重要。

Large diameter (11.58 m) slurry balance shield is used for boring North Huancheng Road underground expressway tunnel crossing underneath existing ShanghaiHangzhou highspeed railway bridge and culvert. Considering the complex environment the shield tunnel located and the safety of the running of highspeed railway, the longitudinal and circumferential structural responses induced by shield tunneling are monitored by means of longitudinal and circumferential rebar stressmeter. The monitoring results show that: 1) The longitudinal and circumferential differential settlement rates are 0.20‰ and 0.30‰, which can meet the requirement of safe construction of railway. 2) The thrusting force of shield varies with the change of shield attitude and has a significant influence on segment force and displacement of bridge and culvert; the longitudinal axial force of the segment top is larger than that on the segment feet; the circumferential bending moment of the segment waist followed by that of the segment top and that of segment feet; and the circumferential bending moment of the segment shoulder is the smallest. The study results show that the monitoring of the shield tunnel structure is important as well.